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Aeronautical Radio Altimeters
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According to the International Civil Aviation Organization (ICAO):
"Th[is] band is used exclusively for airborne radio altimeters (also called radar altimeters) (see Footnote 5.438), which have a vital task in automated landing for flare guidance, and as the sensor component in ground proximity warning systems. The basic function of radio altimeters is to measure the aircraft's absolute height above ground level... These radio altimeters are operational during all phases of flight."
The center frequency for radio altimeters is 4300 +/- 25 MHz. The altimeters use a power output of 20-500 mW, and have a range of up to about 5000 ft (about 1526 m). Their antenna beamwidth is 70 deg, and the pulse width is approximately 200 ns.
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Frequency Bands |
| Band | Use | Service11 | Table |
| 4200 - 4400 MHz | Radio Altimeters | Aeronautical Radionavigation | - |
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